The Optimization Study On Ore Allocation Scheme For Large Sintering Machine In Baotou Iron And Steel (Group) Co.

Sinter is still the main burden of blast furnace in China.The production quality of sinter directly affects its behavior and technical indexes in blast furnace,and the quality of sinter is closely related to the performance of iron ore powder.With the development of modern iron and steel industry and the promotion of market economy,the contradiction between production cost and economic benefits is very prominent.Reducing cost and improving product quality is extremely urgent.Baotou steel iron 500 m² sintering machine matching is 4150 m3 blast furnace,and also put forward higher requirements for the sinter quality,the influence factors of raw material,control,production costs are higher SiO₂content problem to be solved.How to use more advanced technology of sintering machine,through the reasonable configuration of iron material optimizing sinter quality and reducing sinter cost study is the main purpose.Sintering cup experiment was adopted,combined with scanning electron microscope and other detection methods.According to the resource status of iron materials used in the existing sintering machine,firstly,the determination of suitable iron materials structure before production was explored.Secondly,the optimization of iron material structure in the early stage of production;Finally,the structure optimization of high cost performance iron material is studied.Physical and chemical parameters,technological parameters,metallurgical properties,mineral composition,microstructure and particle size of sinter were compared and analyzed.Study concluded that the first iron material proportioning schemes for"50%Australian fine+30%to+20%mixed fine"is based on iron material resources to the company to choose,powder ore ratio is high,the material layer permeability is good,due to the high proportion of hematite,the sinter low content of MgO style control at the same time,can meet the big super thick layer of 760mm on sintering production requirements,and can meet the needs of large blast furnace smelting;In the early stage of production,imported Australian powder,imported Mongolian ore reprocessed iron concentrate and self-produced balun iron concentrate are selected.From the chemical composition of three kinds of iron materials,because the self-produced balun contains potassium,sodium and other harmful elements,the proportion of it in the 4000-grade blast furnace is reduced as far as possible,so as to reduce the cyclic enrichment of potassium and sodium in the blast furnace.Finally,the sintering machine selects the mixed ore with iron structure of"50%imported Australian powder+30%Mongolian essence+20%barrun concentrate",the basicity of sinter is 2.0,the MgO content of sinter is 2.0%,and the MgO content of sinter is adjusted by serpentine.Sinter can achieve the target of grade close to 58%,FeO content at about 8%,strength above 78%and solid burnup consumption below 50kg/t.It not only has a low ore matching cost,but also has the best sinter strength and RI index.This plan is reasonable.However,in order to further realize cost reduction and efficiency,there is still room for improvement in the proportion of barrun ore.The SiO₂ content of barrun ore is low.In order to control the SiO₂ content of sinter,barrun ore can replace a certain proportion of Australian powder.